Evan Hunzinger - Post-commit Hooks (2nd Demo)

Evan's working on creating new Git, Mercurial, and Subversion post-commit hooks for repositories that will automatically close review requests when a matching commit has been pushed. This brings the same functionality to standalone repositories that users of GitHub have become accustomed to.
In Evan's final demo for the semester, he shows off Mercurial and Subversion post-commit hooks working. In total, he's completed working post-commit hooks for Git, Mercurial, and Subversion now, and we should be able to deliver these in a future release of RBTools.
See Evan's previous demo video for the post-commit hooks:
* Demo 1: https://www.youtube.com/watch?v=nn\_II3qgeYM
And his previous demo videos for `rbt status`:
* Demo 2: https://www.youtube.com/watch?v=I6qN9ZCMm2M
* Demo 1: https://www.youtube.com/watch?v=hSLnNXudF98
Evan is a Spring 2016 UCOSP student working with the Review Board project.